activity sampling


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activity sampling

[‚ak′tiv·əd·ē ‚sam·pliŋ]
(industrial engineering)
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Skidding activity sampling results indicate that harvesting the additional small non-merchantable trees congested the landing.
Since processor productivity per tree or volume was not directly measured, the following formula, using activity sampling results, was used to estimate its productive capability:
WOS = percent of activity sampling observations that the processor was waiting on a skidder
This formula reduces the processor's productivity by the total percentage of skidder and processor waiting time recorded during activity sampling. This calculation was necessary to adjust processor productivity because its capability is directly related to skidding productivity.
From activity sampling, 83.88 percent of observations were recorded for adjusting log sorts (53.36%) and loading merchantable logs (30.52%).
PL = percent of activity sampling observations recorded as loading roundwood
PNM = percent of activity sampling observations recorded as separating non-merchantable and merchantable trees
These operations occurred approximately 2 months after conventional harvesting and were, therefore, not included in simultaneous activity sampling. Processing times per load and scale tickets, however, were recorded for determining productivity.
Activity sampling on the machines took place over a six-week period in late 1991.